ISSN Online: 2377-424X
International Heat Transfer Conference 12
Concentration Profiles at Interfaces
Abstrakt
In this paper are described the experimental investigations of the mass transfer processes of a fluorescent dye
(rhodamine 6G) across an interface between two partially miscible liquids (water and 1-butanol) with an optical
measurement technique, the laser induced fluorescence (LIF). The results of the experiments, the twodimensional
concentration profiles, are measurable with a high spatial (110 μm) and temporal (25 ms)
resolution. The concentration profiles across the interface do not correspond with those expected on basis of
conventional theories. A distribution equilibrium at the interface could not be found and the concentrations are
changing continuously from a minimum value in the aqueous phase to a maximum in the organic phase. Possible
explanations of the observed phenomena are given.